A) saltpetre
B) rock phosphate
C) coking coal
D) All of these
Correct Answer: C
Solution :
Exp. [c] The coal found in India is mainly of non-coking quality, and hence coking coal has to be imported. 70% of the steel produced today uses coal. Metallurgical coal (or coking coal) is a vital ingredient in the steel making process. Coking coal is converted to coke by driving off impurities to leave almost pure carbon. During the iron-making process, a blast furnace is fed with the iron ore, coke and small quantities of fluxes (minerals, such as limestone, which are used to collect impurities).
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